Characteristics Associated with Negative Interferon-γ Release Assay Results in Culture-Confirmed Tuberculosis Patients, Texas, USA, 2013–2015

Nguyen, Duc T.; Teeter, Larry D.; Graves, Julie; Graviss, Edward A.

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Characteristics Associated with Negative Interferon-γ Release Assay Results in Culture-Confirmed Tuberculosis Patients, Texas, USA, 2013–2015

Published Date:

Mar 2018

Source:

Emerg Infect Dis. 24(3):534-540.

[PDF-2.00 MB]

Details:

Personal Authors:

Nguyen, Duc T. ; Teeter, Larry D. ; Graves, Julie ; Graviss, Edward A. ;

Keywords:

[+]

Pubmed ID:

29460756

Pubmed Central ID:

PMC5823348

Description:

Interferon-γ release assays (IGRAs) are the preferred diagnostic test for tuberculosis (TB) infection in at-risk populations in developed countries. However, IGRAs have high false-negative rates in patients with TB disease. Population-based studies assessing the factors associated with negative IGRA results in TB patients have not been performed. Using statewide TB surveillance data of culture-confirmed TB patients in Texas, USA, during 2013-2015, we describe the patient characteristics and treatment outcomes associated with false-negative IGRA results. Among 2,854 TB patients, 1,527 (53.5%) had an IGRA result; 97.4% (1,487/1,527) of those had a positive (87.7%) or negative (12.3%) result. Older age, HIV co-infection, non-Hispanic white race/ethnicity, and being tested with T-SPOT.TB were associated with negative IGRA results. TB patients with negative IGRA results had a higher mortality, potentially due to delayed treatment. Healthcare providers should consider these risk factors when making decisions for patients with suspected TB and negative IGRA results and potentially provide treatment.

Document Type:

Journal Article

Collection(s):

Emerging Infectious Diseases

Supporting Files:

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